NZ Topo - object class siphon_poly

This page describe the siphon_poly object class used to represent objects in the NZTopo topographic database.


A pipe system comprising a rising leg and a falling leg, typically in the shape of an inverted U. Works on atmospheric pressure

Topo50 description

Only those significant by their size or location are held in the data and shown on the printed maps. Small but significant siphons are captured as point features

Representation specification

Representation specification showing siphon_poly

Click to enlarge image

See also: canal_poly

Class attributes

Object classsiphon_poly
Entity classSIPHON
Additional entity classNot applicable
Object inheritancesimple_area
Entity sourceProposed NZ Std Entity
Map series Topo50
LSLIFF object class345

Object attributes

AttributeLSLIFF code
Shapefile field
Data type
Attribute descriptionAttribute values*
A unique identifier for use on Topo50 data in the LINZ Data Service. This is not a universal ID. The intention is to manage these ID’s as persistent, however this is not guaranteed and there will be instances where what appears to be a minor change to a feature may result in a new ID being assigned.

* See explanation of attribute values for more information about how attribute values are represented.

Change log

Feature versionRevisedDescription
62012-08-28Updated map image and aerial view; added representation specification and example feature photographs
52012-08-28Added scale-specific definitions
42009-02-01added attribute
32008-04-10removed reference to seed and void objects
22001-11-23unspecified update
11999-03-01intial status